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Letters Patent 1V0. 67,025, dated July 23, 1867.

COMPOSITION FOR DENTAL PLATE.

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TO ALL WHOM IT MAY CONCERN:

130 it known that I, G. F. J. COLDURN, of Newark, in the county of Essex, and State of New Jersey, have invented a new and improved Composition-Plate for Artificial Teeth; and I do hereby declare'that the following is a full, clear, and exact description thereof, which will enable others skilled inthe art to make and use the same.

This inventionrelatos to a new and improved composition for the plates in which artificial teeth or teeth and gums are set.

The objectof theinvention is to obtain a composition for the purpose specified which will admit of being manufactured or moulded'into the desired form, and the teeth, or teeth and gums, set into it with far greater facility than hitherto and which will also possess the advantage of admitting of repairs being made (broken teeth replaced) with far less difficulty than with either the metallic (gold) plate or with the hard-rubber or vulcanite plate. I

it of its frangibility and give the requisite degree of toughness. In the course of my experience I have found asbestos to answer this purpose in an eminent. degree. I

The following are the ingredients of my improved composition, whichl have used with perfect success: No. 1, gum-shellac, one ounce; No. 2, asbestos, seven pennyweights; No. 3, oxide of zinc, six pennyw'eights; No. 4, sulphur, one pennyweight six grains; No. 5, chalk, one pennyweight. These ingredients are put into a. mortar and pulverized, and then fused or melted together.

The composition thus formed may be softened by heat and moulded into plates to suit the mouth. in sub- The basis of my improved composition consists of gum-shellac mixed with a. substance which will deprive stantially the same way as is practised to form the hard-rubber plates, and'the teeth or teeth and gums may be secured in the plate by means of pins, in the same manner as teeth are secured in the hard-rubber plates.

My invention simply requires to bemoulded into the proper form; no after-heating or baking is required,

as in using the vulcanite or hard-rubber plates, and in case a tooth be broken from the plate, a new one can be inserted in it and united by fusion at a comparatively low temperature, whereas with the vulcanite or hardrubber plates theyrequirc, after a new tooth is inserted in them,.to be subjected to a high heat in a retort, in

order to unite the'parts by fusion, as the vulcanite fuses only at a high temperature, and the process occupies about three hours.

My composition is not affected by any acids to which it may be subjected in the mouth. It has been thoroughly tested in this respect. Sulphuric acid will noteven destroy its lustre. It is insoluble in water, and extremely tough and strong, similar to the vulcanite or hard rubber, while the natural shade of gum or flesh 'color may be given it without any difliculty whatever.

Having thus described my invention, what-I claim as new, and desire to secure by Letters Patent, is-- A} composition for the plates of artificial teeth, composed of the ingredients No. 1 and No. 2, with anv suitable coloring substances, such as Nos. 3. 4. 5. substantially asset forth.

G. F. J'. COLBURN.

Witnesses:

WM. F. MGNAMABA, ALEX. FfRossnTs 

